Combination tool head and grinding machine



Ailg. 27, 1940.

w. N. CHITTENDEN 2,212,855 COMBINATION TOOL HEAD AND GRINDI NG MACHINEFiled Oct. 6, 1937 4 Sheets-Sheet 1 Mlvasan N. Gan a/men; I

W. N.' ICHITI'ENDEN 2,212,855 comsmgn on TOOL HEAD mcamnme mourns Aug,27 1940.

4 She ets-Shebt 2 Filed on. $133937.

Au yzz 1940. w. n cmmhmaw .2 .8

COMBINATION TOOL HEAD AND GRINDING MACHINE I Filed Oct. 6, 19:57 11sheets-sheaf z;

Aug. 27, 1940. w. CHIJTTENDEN v COMBINATION TOOL HEAD AND GRINDINGMACHINE INVENTOR Wmason N. CHITTENDEN ATTORNEY meted Au 27,

1 UNITED STATES amass I a cormnw'rron 'r'oor. new m ammonia Windsor N.Chittenden,hagrin am; i

signer, by mesne cinnati Milling Machine. .00., a corporation of Ohioditioning tools possessed of versatility of opera-" heretofore,

tion adjustment and efllciency not achieved in. this. art.

a construction of the above character which will be sturdy and well ableto withstand hard usage. Another object is to provide a construction ofthe above character which may be quickly and easily operated by theuser: Another object is to provide an emcient and practicalcombinationtool head and grinding machine.

to provide a construction of the above character which is adapted towork upon .a large variety of '15 different types of tools. A furtherobject of the above construction is to provide a combination tool headand grinding machine which .is more versatile than any previously known,and which is adapted for use to quickly and cheaply acconf- :m plish'thevarious grinding or sharpening opera-- tions required in the maintainingofsmall sharm ening tools; such as twist drills. reamers, counterers,milling cutters, hobs, 'and the like. A

st further object of this invention is to provide apparatus whichenables the grinding'or sharpening' of tools or the like with greaterprecision than:

has heretofore been obtainable.

A special feature of improvement employed in the present machine asdistinguished from the toolhead' feature of my copending application,

lies in the provision of peculiar adjusting means for the guide ortablesupporting the tool holding devices of the tool head, wherebyslight inaccuracies that might be caused'by-the bending moment inducedby operation ofthe. screw all g justing means that shifts the guide ortable longi-- t'udinally are substantially completely avoided.The-importance of this feature of my invention will be recognized if itis understood that in finer o0 tool-manufacture and re-conditionlng.mac-- curacies of the slightest extent, running into mere thousandths ofan inch. may prevent the completion or re-conditioning of a perfect toolor the like. --56- Still another feature of my inventioniresides Oneprimary purposeof the present inven-' Another object of this inventionisto provide Another object is .Flgures'land 8.

1r to The Gin-Q Cincinnati, omo,

1937, Serial N... isms- (or 51-991 in the employment, for thelongitudinal movementof the said guide or table for the tool'holdingdevice of the tool head, of alternatively usable adiusting'means, oneadapted for handy use in guide or table positions the other adjustingmeans whereit may be more or less inaccessible for operation. Also,'the' oneof the said adjusting nieans which is alwaysaccessihle may beused advantageously under finestadjustments are not, needed ir'ftheoperations of toolmanufacture and re-conditioning.

Additional to the foregoing, the invention involves'the employmentofmain and auxiliary grinder holding devices with which the grinding l5--ma'chine unit of my combination machine. is

equipped, the auxiliary grinder holder being availed of under specialconditions of use where the main holder cannot be employed at all or isnotsusceptible of advantageous use. Moreover; 20 I the auxiliary holderis designed to be operated at much higher speed than the main holder, asimay be required'for certain kinds of work.

Other objectswili be in part obvious and in part pointed outhereinafter. j

Inthedrawings: r .Figure 1-15 a perspective view of a combina-- tiontool head andgrinding machine embodying the. general features of theinvention;

shownin section; y

Figure 3 is a side elevation of'the guide or table for the 1 head,looking at the oppositeside fromthat osed in Figure 2, showing the 35plurality of adjusting means employed :for ad- -justment of the guide ortable of the tool head; Figure em a partial section-and partial top planview showing more fully the adjusting means for the guide ortable of thetool head; 4o

' Figure 5 is an end el'evation taken ifrom'the right hand; side of themachineishown in Figure,2;-@ g Figure 6 is a fragmentary detailed viewon an enlarged scale illustrating "the mechanism by which the rotationis imparted to the tool mountinespin e; 5 P -l 'igurejl is a sideelevation of a modification of a portion of the machine shown in'Flgure-1; I

Figure 8 is an end elevation taken'from the right hand side of themodification shown in E ure 2; and. Figure 9 is a perspectiveview on anenlarged scale ofcertain parts of the mechanism shown in .-the event thedisposition or adjustment-of the'g conditions where the m Figure'2 is aview in end elevation of the tool- 30 I head'with certain 'of the partsbroken away and Now 'referring to the drawings, and especially to Figure1, indicates the frame structure of a grinding machine which is providedwith 9. lateral extendingv support 2 for, carrying a tool head generallyindicated at 3. While this part is here properly termed a tool head, asthe work is is further provided with an upper part 4 longi tudinally andtransversely movable with respect to the lower frame structure 5., Thelongitudinal and transverse movement of the portion 4 of the framestructure is accomplished by the operation of hand wheelsG and '1,respectively.

By turning the hand wheel 6, longitudinal movement of the frame portion4 is effected, while turning of the hand wheel 7 causes a transversemovement thereof. Mounted on the upper frame structure 4 is a movablepart or guide 8 which is secured to the portion 4 by means ofdove-tailed guide members or the like usually employedin this art. Thevertical movement of the member 8 is effected by rotation of a handwheel 9. Mounted upon the vertical guide member 8 is an electric motorIn, which is rigidly secured thereto and represents the source of. powerfor the working operations of the grinding machine. A bearing orsupporting structure H extends laterally from the vertical guide 8 andcarries a sleeve like bearing l2 fixed thereto.

Arranged within the sleeve-like bearing portion I2 is a shaft |3 whichis adapted to carry at one of its ends a grinding wheel H such as shownin Figure 2, or it may carry a pulley l5 as illustrated in Figure 1.

Securing means l6 are provided on the shaft l3 to permit an easygrinding wheel I 4 or the pulley l5.

' The motor (Figure 1') comprises the usual shaft upon which a pulley I8is mounted; The shaft |3 carries at its end adjacent the pulley 8 apulley l9 interconnected for rotation with the pulley |8 by'means of abelt 2|]. Attached to the outer circumference of the stationary bearingsleeve I2 is an auxiliary grinder holding device 2| provided-withclamping instrumentalities 22. When the clamping instrumentalities 22are loosened,,the auxiliary grinder holding device may be.

swung into operative or inoperative position.

Figure 1 shows the. auxiliary grinding holder device in operativeposition in which it is held securely by clamping means 22 when the sameare tightened. The auxiliary grinder holding device carries a shaft 23mounted within the body of the grinder holding device in anyconventional manner, and a pulley 24 is keyed to said shaft and isrotatably interconnected with shaft |3 by means of a drive belt 25 whichengages the pulley l5.

The free end of the shaft 23 carries a chuck 26 to which is secured asmall grinding wheel or any equivalent device, as illustrated at 21;

When it is contemplated to use the grinding wheel l4, as shown in Figure2, the auxiliary grinder holding device 2| is swung out of the wayupwardly, and locked in this position, while the pulley l and'thedriving belt 25 are removed to permit attachment of the grinding wheel Hto .the shaft l3. With the parts in position, any regular grindingoperation may be performed by the grinding machine'as will be moreapparent from the following description; while, when the'auxiliarygrinder is used, as 'shownin Figure attachment of either the 1, veryfine and delicate grinding operations may be obtained by the use of thesmall grinding device 21 and the dimensions of the pulleys l5 and 24permit grinding device 21 to be rotated at ample speed to accomplish the-most accurate grinding, sharpening, or reconditioning operations.

The grinding machine structure referred to above, as illustrated inFigures 1, 2, and 5 is primarily adapted to be used in connection withthe tool head 3, which is carried by the support 2 which forms a part ofthe grinding machine frame as previously referred to. The tool headstructure 3 comprises a base or shoe 28 within which a turnable part 29is rotatably mounted.

As best seen inFigures l and 2, the base 28 is fastened to a tubularportion 38 by inserting the lower portion of the base 28 therein andsecuring the same thereon in any convenient manner. However, if desiredbase 28 may form an integral structure of the portion 38 of the support2. Between base 28 and'part 29 anti-friction bearing members may bepositionedto facilitate the rotation of the part 29 around the verticalaxis of the base 28.-

Locking instrumentalities 3| (Figures 1, 2, and 5) are employed forlocking part 29 in any de' sired angular position with respect to base28. The locking means 3| which carries the'handle 3|a ispreferably'positioned within the support 2 as will be clearly seen fromFigure 1. Part 29 is preferably provided with a flange havinggraduations or other indicia thereon to indicate the relative positionthereof respecting the base 28 and stop members 32 and 33 on therotatable part 29 and the stationary part 28 may be provided of therotary adjust-,

to facilitate the setting I ment of part 29 with respect to the base.One of these stop members, preferably the stop member 33, is sopositioned on be shifted to adesired Referring now more position andlocked.

specifically to Figures 2 the base 28 that it may and 5, it willbenoticed that the part 29 is provided with a dovetail guide 34uponwhich a slide member 35 is mounted, the latter being transverselyadjustable with respect to, the turnable part 29 of'the base by means ofadjusting screw 36- as shown in Figures and 5 which engages a nut whichis not illustrated and which forms a part of the rotatable base member29. Thisarrangement permits an offsetting in a horizontal plane of thetool head apparatus with respect to the amount of oifset.

The slide. member 35 carries likewise a dovetailed guide 37 (Figures 2and 5) upon which the mainframe or bed 38 is mounted. This guide 31 ispositioned at a right angle with respect to the guide 34 to permit anofl'set adjustment of the main frame 38 at a right angle to the slidemember 35. A table or slide 39 is arranged for 'longitudtnal shiftingmovement with respect to the main frame 38 and this shifting movement iscaused by the operation of 'manually operable instrumentalities such asscrew 89, crank member 8| (Figure 1) and hand wheel 80. Theinstrumentalities which effect the longitudinal shifting movement of thetable or slide 39 are illustrated in Figures 3 and 4, and morespecifically described later on. g

It will be understood, however, that by operating the crank 8| or handwheel 80, as will be seen in specific reference to Figures 3 and 4, the

' table 39 will be shifted longitudinally in one 11.

a 2,a1a,ee's rection, whereas by turning theabove mentioned parts 80 andM in an opposite direction, the table will be shifted also in anopposite directlon. A tailstock 4|, the use 0! which is optional, is

mounted on guides I02 (Flgurel2) and is of a more or less conventionalconstruction, but the upper part 42 of the same may be pivoted aroundthe screw connection "which also permits positioning and locking ot.thepart 42 at a desired angle. The table carries a spindle 44 (Figures 1,2, and 5) rotatably mounted in suitable bearings within the housingstructure a. The housing structure a is pivotally mounted on shaft 40(Figure 2) which extends transversely of the machine and is journaled inbearings (not shown) 3 mounted on uprights l6 and 46. These uprights(Figure 5) form an integral structure with the table 33, and thushousinga and spindle 44 are vertically adjustable with respect to the toolhead. The adjustment of the spindle H to any angular position iseflected by loosening and tightening the clamping screws I] and 40, .andthus the machine is adapted to mount tools atdifferent angles as theirshape requires. .Table 39 also carries van'adjustable indicating feeleror finger I00, which traverses the flutes of a tool on movement of table39.to ensure that the settings are correct according to the desiredultimate resultwhen the grinding wheel is set in operation.

One end of the spindle ll carries the chuck (Figures 2 and 6) or anytoolreceiving means to be mounted on the spindle. Mounted on the spindle44 at its 'end opposite chuck 49 is a gear 50- within the housing orhead a. This gear 50 is in cooperative engagement with the gear 39amounted-upon axis or shaft 46, the latter extending transversely throughthe housing a at a the side of theupright support l6. 'The housingissomewhat enlarged at that portion to. receive the comparatively largegear 30a just referred to.

Another gear 5| on shaft 40 engagesthe teeth of rack 52, slidablyarranged within'a casing 53 attached-to the housing a. The lower end ofthe rack 52 (Figures 5 and 6) is pivoted to the block 54 which has adove -tailed groove 55 operatively connected to a sine bar 56. The sinebare 56 is pivotally mounted on a i'ront'platie 51 and-is provided atits huh bearing portion 56 with graduations 59.

The hub of the sine bar 56 is provided with teeth 60 (Figures 2 and 6)eng d by a worm 8| e which may be operated by placing a crank handleupon the square end portion 62 of the worm shaft Ill. The worm 6| may beeither of the self locking-type or may be locked by a set screw 64 whenthe sine bar has been moved to a desired position of inclination. V

The gear 50, previously referred to, is loosely mounted upon spindle andis provided with a hub portiontowhich an indexing plate 65 is secured bymeans of a clamp 66. The end of the spindle ll opposite chuck 43 carriesa member 63 fixed to the spindle and supporting ,an axiallyshifting pin67 which may be manually moved in and out of engagement with holes 66(Figure 5) in the plate 65. When the pin 61 is'engaged with one of theholes 66 it will .be held in this e g ed position by means. of certaininstrumentalities, not shown, which shift the pin axially toward theplate 65 when the pin :61 which is manually operated is released.

'- In view of the fact that the part a is fastened to the spindle 4|,itwill be-seen that by removing the pin 61 from one of the holes 66 ofthe plate",

the spindle maybe manually rotated to a desired position where it may beheld by placing pin 61 in the hole in the indexing plate 65 which is atthat time juxtaposed to the pin. This turning of the spindle permits thepositioning of a tool to be sharpened, reconditioned, '"or manufacturedby the machine of the present invention, which is indicated in Figure l.

This adjustment of the spindle may be called the indexing adjustment ofthe tool head. Obs

and rack 52, is interrupted.

Referring now to Figures fl, 8', and 9, there is shown in these figuresa modified form of indexing mechanism for finer indexing adjustmentsthan the indexing instrumentalitiesshown in Figures 2, 5, and 6. In themodified construction, the same or a similar indexing plate 65 isemployed, together with its clamping means 66 for clamping the sameabout the hub of gear 50, it being understood that this gear 50 isloosely mounted on the spindle 44. As described hereinabove, a member631s positioned adjacent indexing plate 65 and carries a pin 61 forselective interengagement with the holes 66 of the indexing plate.However, member 63'is loosely. mounted on the spindle 44 instead ofbeing clamped theretoas in Figures 2, 5, and 6 and member 63 is alsoprovided with an elongated aperture I02,

as best seen in Figure 9. Next to the member 63 is a third member I03(Figure '1) generally similar "to member 63 but having provision forclamping engagement about the spindle 46 through means of the clampinginstrumental ities designated I04. This member I03 carries 'a pin I05,which is rotatably mounted thereon,

and the inner end of the pin is provided with an eccentric portion I06engageable in the elongated aperture I02 of member 63. Thus, by rotatingthe' pin l05 through means of the adjusting knobs I01 provided thereon,arelatively me indexing adjustment-of the spindle 44 may beattainedintermediatethe coarser indexing adjustm'ents selectively provided bythe selective interengagement of the pin 61 with the holes 60 of theindexing plate 65. A set screw 106 is preterably provided on the memberI03 so as to permit the pin l05to be secured in a position of selectiverelatively fine indexing adjustment.

' The periphery of index plate 65 is-shaped to receive a belt driven bymotor'.| 3 through pulley 14. In such case the clamp 66 is loosened soas to disconnect the driving connection between the 'indexing mechanismand the rack 52. The spihdie 44 may be now rotated at a certain speedwithout being-affected by operations caused by the rack and geararrangements :referred to above,

7 Referring now more particularly to the operation of the tool head forperforming certain grinding, or reconditioning operations, it will benoted thatwhen the sine bar 56 is positioned at e certain given angle(Figures 2 and 6), the longitudinal movement or the table 39 andjtheparts supportedthereby will cause theslide block or slide member 56 toslide along the sine bar and reciprocate rack 52 upwardly anddownwardly. causing'rotation of the spindle. .As has been pointed outhereinabove, the sine bar 66 70 maybe set so that it inclines upwardlyto the left or right of the machine as viewed in Fig ure 2; Thus, thespindle, in response to move ment of the table in a given direction, maybe I made to. rotate eithera clockwise'or a counter 15 10 viously,during such indexing operation, the en- Y gagement between the plate 65,gears 50, 30a, 5|,

clockwise direction, the direction and degree of rotation depending onthe direction and degree of inclination of the sine bar.

Thus, thedegree of rotation the table 39 can be varied as desired, andwhen the sine bar 56 is in horizontal position, no rotation is impartedto the spindle 44. The operation of the tool head by the handle 8| orhand wheel 89 permits, therefore, a shifting of the tool 16 toward thegrinding wheel H or 21, while at the same time the tool is rotatedaccording to the adjustment of the sine bar so that the grinding wheelmay be maintained in operative ing of the table 39 in either contactwith the tool 18 over a spiral path such as the spiral cutting edge ofAlso, the straight cutting edges of a reamer may be sharpened by thismachine. In this .case, the sine bar would be set at a zero orhorizontal position so that no movement is imparted to the reamer whichwould be in such case secured to the spindle 44 by chuck 49.

It follows from the above that the tool to be reconditioned is movedagainst the grinding wheel 14 and away from the same bytheshiftdirection of its longitudinal movement, The shaft 44 maybepositioned in a vertical angular position with respect to thegrindingwheel I l or the grinding wheel 21, and the other adjusting andoffsetting adjustments of the tool head with respect to the base 2 ofthe grinding machine and grinding wheel ll permit of a great flexibilityof positioning the tool to be reconditioned with respect to the grindinginstrumentalities of the grinding machine,

The various adjustments of the grinding ma chine itself permitfurthermore the adjustment 7 of the grinding instrumentalities H or 21in many ways, i. e., in horizontal, longitudinal and verticaldirections, with respect to the tool head so that a great versatility ofoperation, adjustment and efliciency not heretofore-achieved in this artof machinery can be obtained'and this great flexibility of the entiredevice. permits the manufacture or reconditioning of tools or likedevices of the most difllcult and precise construction, as will beappreciated by those sln'lled in the art.

Referring now more specifically to Figures 3.

and 4, the manually operable means for causing longitudinal shifting ofthe table 39 are especially designed to permit the accomplishment ofhighly accurate work with the apparatus of the present invention.

It will be obvious to those skilled in the art that upon operation ofthe handle 8|, as clearly shown in Figures 1 and 2, a bending moment 15applied to the table 39 which tends' to move the same either upward ordownward with respect to the base 28 of the structure I of the toolhead.

\ In view of the fact that the handle 8| is at a remote position withrespect to the vertical center of the base 28, and in view of the factthat the guide or table 39 and the other longitudinal and transverseguides employed in the tool head structure of the present invention havesome play, even though very slight, the action of the above mentionedbending moment will cause a very slight up and down-movement of thetable 39 and tool 18, and while these movements are hardly noticeable,they will nevertheless cause certain inaccuracies in the grindingoperation. To

eliminate this disadvantage, a hand wheel 89 has been provided besidethe handle: 8|. Both of or the spindle u -for a given amount oflongitudinal movement of a (hill, or the like.

locking shank '96 and between means these operating means for the screw89 may be alternatively used for shiftingthe table 39, and the handwheel 89 will beprimarily' used insuch instances wheregreatest precisionof workmanship is desired because the hand'wheelis, during alladjustments of the apparatus, either above or very close to the verticalcenter of'the base 28 and obviously the bending or up and down movementof the table '39 is practically eliminated -when the hand ,wheel isemployed for longitudinal shifting of the table.

Referring more specifically to Figure 4, the hand wheel 88 is mounted ona shaft 83, which carries a bevel gear 84 and is supported by -a bearingflange 85 on the frame 38. A bridge 86 with a bearing sleeve 81, and apart 88 holds thefree end of a screw 89 in a certain position with re--spect to shaft 83, Removal of the shaft 83 is prevented by means ofcollars 90 and 9|. A look dev'ice'92 permits locking of shaft 83 in anyposition of rotation. Rotatably mounted within the hearing 8 of thebridge 86 is an inwardly threaded coopersecured to the sleeve in anyconvenient manner.

The other end of the'screw 89 comprises a reduced shank 96 mounted in abearing 91 secured to the table 39 by means of head screws 98. Thebearing .91 is provided with a clamping portion 99 which may betightened by a screw N10 for screw 89 in any position of rotation.Secured to the free end of the shank 98 is thehandle 8l already referredto, and

collars HH and I82 are fastened to shank 96 in any conventional mannerto prevent longitudinal movement of the screw 89.

When the shaft 83 is locked against rotation and the clamp 99 loosenedthe screw 89' may be rotated by means of the handle 8| while the sleeveis in fixed position secured to the frame 38 by means of bridge 86 andshaft 83.

The screw 89, will, therefore, move with regard to the sleeve 93 so thata relative shifting 39 and 38 is accomplished. When operation of theparts 39 and 38, relative to each other by means of the hand wheel 89 isdesired, all that is necessary is to tighten clamp 99 by means of screw189 andto loosen lock 92.

In this-case, screw 89 is locked against rotation,

and bevel gear-93a and sleeve 93 are rotated by means of hand wheel 89,shaft 83 and bevel gear 84, and 'a relative shifting of the parts 39 and38 is produced. v

The employment of the handle 8| is necessary because when the machine isrotated around its base under certain conditions to the grinding machineframe I, and may, therefore, be very inconvenient to operate.

From the above it will be noted that depending upon the nature of workto be performed with 28, the hand wheel 88 may be very close.

the machine of the present invention, a grinding tool is attached to thegrinding tool holder' l8 of the tool shaft l3, or a grinding tool 21..see Figure 1, is attached to the auxiliary tool shaft 23, after the samehas been moved to operative position and interconnected for operationwith the tool shaft l3 by means of pulleys I 5 and 2,4 and drive I belt25. Upon operation of'the motor I0, either the tool shaft l3 and grinderM, or the tool shaft l3, auxiliary tool shaft 23 and grinder 21, areoperated at desired speed. l v

The tool to be resharpened, as for instance r r 2,242,855 tool- 15, isinserted into' the tool holder u and.

either the grinder II or grinder'Tl is-brought into proper cuttingposition by manipulation oi the adjustments 6, i and 9 as describedhereinabove. thereupon, the tool head which carries the tool holder andthe tool 'lfiis properly adjusted and positioned so that by turning ofthe hand wheel 80 or handle 8|, the tool 16 is moved into engagementwith the. rotating grinder to effect the desired grinding operations. vv

.As mentioned. herei'nbefore, the grinder. H or grinder 21 may beadjusted in any desired verticaL-iateral or horizontal position withrespect to the tool 16 which is to be resharpened, reconditioned, or,which is to be manufactured from original stock.

In a like'manner,

the tool head affords any desired adjustment of the tool 16 withrespecttothe grinder it or 2150 that all working operations can .beeasily can'ied out. The arrangement and construction of the tool headpermits further angular adjustments thereot'with respect to itshorizontal, vertical 'and lateral planes,

and aifordsTurther a rotation of the tool 16 to any'desired degree ineither direction, while the.

tool and tool head are moved toward-and away from the grinder uponoperation of the-hand wheel 80 or handle 8!.

the machine aflords a universal adjustment and operation enabling'itsuse for producing and refinishing mam diversified kinds of tools, andis,

therefore, of aversatility never heretofore accomplished in machinery ofthis kind.

Moreover, it is to be noted that one or the sibleby virtue of thecombination of the available mechanical movements of parts of themachine in all planes as related to the work being produced, therebyenablingthe operator to establish thenodal points and generatedimensionally at a single chucking of the wbrk in the work. holder allgeometrical forms which can be pror and means for adjusting said toolholder longiduced by grinding.

Asexemplifications of the adaptability of the invention to practicaltool making and refinishing, the following is a resume of the differentkinds of work-that can be performed and for which the machine isespecially designed as a ma terl'al improvement over the formerpractices in this art which irequently'involveas many as six set-ups orchucking steps, 'oftentimes on difierent machines, to complete a singlejob; and in each of which chucking or set-ups there is necessarily somerun-out which, is multiplied at every subsequent operation:

1. A machine constructed the present invention will grind spiral'iiuted,

mills, reamers, milling cutters, and the like, from the tool at a singlesetting or chucking operation.

2. The machine will grind circular diameters,

straight or taper, with male or female radii grinding anglesci'rcuiarlyin either the vertical or horis' single chucfing.

From the above, it will, therefore, be seen that in accordance withright orylefthandspiral, straight or taper, end" 3. '1'he machine willgrind hollow mills, including the outside diameter, inside diameter,face, lip, and back oil! each succeeding part or the 1 moles requiredand specified at a single 'chucking of the work. i .5 V 4. The machinewill grind cherrying or form cutters, generating all geometrical parts.or the tool dimensionally, and back off same at a single chucking.- I

5. The machine will generate any true spiral 10 lead from zero to oneand one-third turns per inch.

6. The machine will grind certain types cf 'punches such as squares,triangular, flats, hexagun, and many modifications of these forms, fromIii a solid blank.

7. The machine will grind almost anykind of router completing the entiretool from a solid blank and at a single chucking, I

8. The machine will grind all accessible parts 2 of circular formcutters for screw machine practice.

9. The machine grind sums of many mechanical accessories such as spindlenoses,

'collet's, ball races, spines, etc., locate and produce 2 any number ofsucceeding movements dimensionally, and complete these operations at asingle chucking, with, assurance 6! the utmost in precision andconcentricty.

Other tools too numerous to mention may be 80 added to the foregoing,but it will suilice to say that thepresent invention makes possible thequick and'inexpensive production of many types of tools by grinding fromsolid hardened blanks I without preliminarily machining, as well as an-85 unusual economical reconditioning of tools to give an extendedtoollife.-

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States, is

. 40 1. In a combination grinding machine and tool head, a grindingmachine, a. main grinding dea vice, an auxiliary grinding deviceassociated with the-main grinding device and normally held ininoperativeposition, driving instrumentalities cooperating with the main grindingdevice for operating said auxiliary grinding device when the sameis inposition foroperation, a tool head associated with said grindingmachine, comprising a tool holder, a table supporting said tool holder,5

a grinder, means for adjusting said holder lpngi- I tudinally. andtransversely, instrumentalities to m shift the holder vertically andhold it in-various vertical'positions, and a tool head associated with 7said grinding machine comprising a-tool holder,

:3, table supporting'said'tool holder, mechanismyi'or imparting rotationto the tool holder at a fixed 0 5 ratio of speed-determined by thelongitudinal movement thereof, means for adjusting said tool holderlongitudinally and transversely relatively "to the grinder; devicestofrender thesaid mechanismfor imparting rotation to theltool holder ata fixed ratio of speed inoperative to so actuate the g tool holder, anddriving mechanism for rotating zontal plane, or any combination ofthese, to; predeterminedfgeometrical precision and at a I the toolholder when the above mechanism is rendjered inoperative.-

bination, a supporting table, a work head mounted thereon forlongitudinal movement, means'mountvaried, instrumentalities-for causingrotation of ing said table to permit angular movement thereof about-asubstantially vertical axis, an instrumentality for effecting suchlongitudinal movement of the table, a workholder carried by the tableand movable therewith whereby the effective radius of swing about saidvertical axis is the work holder at a ratio of speed determined by thelongitudinal movement of the work holder with the work head, means toset the last mentioned means to render the same inoperative and thusdiscontinue the rotation of the work holder under the influence ofthelongitudinal movement of the work head, a motor, and means foreffecting driving rotation of the work head by said motor when the abovementioned instrumentalities are incapacitated for. rotating the workhead.

4. In a combination grinding machine and tool head, a grinder, aholderfor saidgrinder, means foradjusting said holder longitudinally andtransversely, instrumentalities to shift said holder vertically and holdit in various vertical positions, and a tool head associated: with saidgrinding machine comprising a work holder, mechanism for impartingrotation to said. work holder, a table supporting sai'd'work holder,means for adjusting said work'holder longitudinally, transversely, anddevices for enabling adjustment and to maintain said work holder atdifiere'nt degrees of verticai and horizontal angularity' relatively tosaid grinder. a

5. A grinding machine comprising a holder for a grinder, adjusting meansfor effecting horizontal adjustments of the grinder, devices to shiftthe grinder vertically and maintain it indifferent positions whensoshifted, a work head comprising a table, a work-holder mounted on saidtable for vertical angular adjustment,'mechanism for impartingrotatio'ntothe work holder, means to lock said verticalgangularadjustment in any position thereoflfmeansfor moving the table to feed"the work holderq longitudinally toward the grinder, means adaptedtogovern said rotation of the work holder proportionallyto said feed andthereby rotatethe work through an'angle determined by said feed, andmeans for rotating the table in a horizontal plane to thereby givedifferent angular adjustments horizontally to the work holder.

6. 'A grinding machine comprising a holder for a grindenadjusting meansfor effecting horizontal adjustments of the grinder, devices to shiftthe grinder vertically and maintain it in different positions when soshifted, a work head comprising,

- position thereof; means for moving the table to I feed the work holderlongitudinally toward the I a table, a work holder mounted on said tablefor vertical angular adjustment, mechanism for imparting rotation to thework holder operative at any vertical angular adjustment thereof, meansto lock said vertical angular-adjustment in any grinder, means adaptedto govern said rotation;

of the work holder proportionally to said feed 4 and thereby rotate thework through an angle determined by said feed, means for rotating thetable'in a horizontal plane to thereby give diii'erent angularadjustments horizontally to the work holder;and means'forefi'ectingtransverse shifting movement of the work holder separate from itshorizontal angular adjustment.

7. Ina grinding machine, the combination of a tool-carrying spindle anda work-carrying spindle,

means for rotatablymounting spindles,means' respect to said device.

8. In a machine of the character described,

combination, a tool support, a work carrier, 15 means providing relativeadjustment of said tool support and carrier vertically, laterally, andlongitudinally, means mounting said work carrier to permit swingingthereof in two planes, and means comprising gearing adapted to rotatesaid 20 work carrier proportionally to its advance toward the tool andmaintain substantially fixed angular relation of the meshing teeth ofsaid gear- 7 9. In apparatus of the class described, in com- 25bination, a rotatable spindle, means mounting said spindle forverticallytilting and bodily horizontal adjustment, means for feeding saidspindle, and means for imparting rotation to said spindle rmponsive tofeeding movement thereof and operativelyconnected therewith at anyvertical angular adjustment thereof, said last-mentioned ,meanscomprising a relatively stationary guide member arranged at an angle tothe path of feeding movement of the spindle, aslide member coacting withsaid guide member and slidable thereon responsive to feeding movement ofthe spindle, and a rack and pinion means interconnecting said slidemember with said spindle, through the axis about which said spindle istiltable.

10. In'apparatus of the class described, incombination, a rotatablespindle, means mounting said spindle for vertically tilting and bodily.horizontal adjustment, means for feeding said spindle and means forimparting rotation at a constant ratio with respect to the feedingmovement thereof and operatively connected therewith at any verticalangular adjustment thereof, said last-named means comprising arelatively stationary guide member, a guide slot within, said guidemember and extending longitudinally withrespect tothe latter, said meansfor impartingerotation to the spindle being arranged at an angle gto thepath of feeding movement of the spindle, a slide member coacting withthe guide slot of said guide member and slidable therein responsive tofeeding movement of the spindle, and rack and pinion meansinterconnecting said slide member with said spindle, through the axisabout which said spindle is tiltable.

11; In apparatus of the class described, in combination, a rotatablespindle, means mounting 'saidspindle for longitudinal shifting movement,

to said spindle 1 responsive to longitudinal shifting of the same,

and spindle at a constant ratio respecting. the longitudinal shiftingmovement of the spindle.

12. In apparatus of the class described, in com-' bination, a rotatablespindle, means mounting said spindle for' -longitudinal shiftingmovement,-

manualty operable means for shifting said spindle, means for-impartingrotation to said spindle means for rendering said last named meansineffective, additional power driving means, and.

. .means adjustable at will for interconnecting said power driving meanswith said spindle for rotatoperating the auxiliary grinder and itsholder 14. In apparatus of the-class described, in'combination, arotatable spindle, means mounting said spindle for longitudinal shiftingmovement,

'means for shifting said spindle longitudinalLv, a

stationary sine bar adjustable at an angle to the path of longitudinalshifting 'movement of the spindle, a slide membermounted on said sinebar and slidable thereon responsive to longitudinal m shifting movementof the spindle, a rack pivotally connected to the slide member andreciprocable thereby, a pinion operatively engaging said rack androtatable thereby, means operatively connecting said pinion with saidspindle for rotating the latter by rotation of the spindle,

wherein means is interposed between the pinion and the spindle forindexing the spindle, said indexing means including a rotatable memberfreely mounted on the spindle and geared to the pinion 60 for rotationthereby and provided with a series of apertures therein, a second memberalso freely mounted on the spindle and carrying shiftable detent meansselectively interengageable with the apertures aforesaid, and having anelongated aperture therein, and a third member fixedly mounted on thespindle and carrying a rotatably adjustable pin having an eccentricportion oper-,

atively interengageable with the elongated aperture in the second memberfor permitting relatively fine indemng adjustments intermediate thecoarser adjustments afforded bythedetent means and cooperating aperturesaforesaid.

15. A tool head for supporting and manipulating tools during themanufacture or reconditioning thereof, comprising a base, an elongatedbed; mounted on said base and adjustably turnable about the verticalaxis thereof, means for adjusting said bed in at least one directionlaterally respecting the vertical axis of said base, a table 70 mountedon said bed and 'slidably shiftable longitudinally of said bed, manuallyoperable means for shifting said table, a spindle rotatably mounted onsaid table and longitudinally shiftable therewith, a stationary sine baradjustably mounted on said bed, a slide member slidable on said sinebar, rack and pinion means operatively connected respectively with theslide member and the spindle and shiftable with the table for rotatingthe spindle responsive to longitudinal shiftingof the table and spindlewhen the sine bar is ad- 'justed at an angle to the path of longitudinalshifting movement of the spindle, means interposed between the rack andpinion means and the spindle for releasablyinterconnecting the formerwith the latter and including spindle indexing means and ,means foradjusting the angular position of the sine bar whereby to permit therate of spindle rotation and rotary position of the spindle to beindependently adjusted at will.

16. The combination, with a grinding machine having a grinding wheelrotatably mounted thereon, of 'a tool head for supporting andmanipulating tools' during the manufacture or reconditioning thereof,said tool head comprising a rotatable spindle, means carried by saidspindle for mounting a tool thereon, means mounting said spindle foradjustment toward and away from the grinding wheel aforesaid and forlongitudinal shifting movement, instrumentalities for adjust ing saidspindle in horizontal and vertical angular positions with respect tosaid grinding wheel, means for shifting said spindle longitudinally,means operable at will for imparting rotation to said spindle responsiveto longitudinal shifting movement of the latter, said last named meansincluding spindle indexing means, and an adjustable ieeler membercooperative with the spindle and the grinding wheel aforesaid forfacilitating adjustment of the spindle, said feeler member occupyinga,position corresponding to the grinding wheel and indicating the pathtraversed by the grinding wheelrespecting the tool pursuant tolongitudinal shifting'and/or rotatable move ments of the spindle.

, 17. In apparatus of'the class described, in combination, a rotatablespindle, means mounting said spindle for longitudinal shifting movement,means for shifting said spindle longitudinally, and means for impartingrotation to said spindle responsive to longitudinal shifting movementthereof, said last named means comprising a stationary sine bar having adovetailed part, a worm gear connected to said sine bar, a wormcooperatively associated with said worm gear for imparting rotation tothe same and said sine bar for causing angular adjustment of the latter,indicating' means on said sine bar for permitting adjustment of said barto a. predetermined position,

a slide member mounted on said sine bar on said part and 'slidablethereon responsive to longitudinal shifting movement of the spindle;rack and pinion means inter-connecting said slide CERTIFICATE OFCORRECTION. Patent No. 2,212,855 August 27, l9LLO.'

WINDSOR N. CHITTENDEN.

"Itis hereby oertified that error appears in the printed specification Ioi the above numbered patent requiring jcorrectionasfolldws: Page 5,first column, line 118, for "bare" read --bar-; page second column, line22) for "hearing 8" read "bearing 88--; page 5, first 601mm, line 56,for

"fu ctions" read---functions--; and second column, line 25, for "spines"read -sp1i nes-; line 29, for eoncentricty read --c'oncen tricity--; andthat the said Letters Patent should be read with this correction thereinthat the same may conform to the record :01 the casein the PatentOffice.

Signed and sealed this 29th day of October, A; 1). 191m.

Henr -Van Arsdale, (Seal) Acting Cqnmissioner of Patents

